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STMicroelectronics TDA7432D
- Part No.:
- TDA7432D
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Special Purpose
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TDA7432D.pdf
- Description:
- IC AUDIO TONE PROCESSOR 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
TDA7432D from STMicroelectronics is a fully programmable stereo audio processor IC for automotive and Hi-Fi systems, integrating volume control in 1dB steps, bass/treble adjustment in 2dB steps, independent four-channel speaker attenuation (0 to –37.5dB), hardware/software mute, and loudness compensation. It interfaces via I²C bus and operates from a 7–10.2V supply.
For engineers reviewing the TDA7432D datasheet, TDA7432D pinout, TDA7432D application, or TDA7432D equivalent, key selection considerations include its 20-pin SO package, ±18dB bass range, 100dB channel separation, 102dB SNR, and support for mono/stereo input routing with hardware AM-mute capability.
Technical Context
The TDA7432D implements analog signal conditioning using resistor networks and op-amps controlled by digitally programmed BIPOLAR/CMOS switches. Its input selector supports three sources: stereo left/right (IN_L/IN_R) and mono AM (MONO_IN/MUTE), with the latter doubling as a hardware mute trigger when grounded.
All gain, tone, balance, and speaker-level functions are configured via an I²C interface operating up to 500 kbit/s, with auto-increment addressing and subaddress mapping for volume, bass, treble, loudness, and four speaker attenuators (LF, LR, RF, RR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 7–10.2 V - Enables direct connection to automotive battery rails with built-in overvoltage protection |
| Volume Control Range | –79 dB to +32 dB in 1 dB steps - Supports precise system-level gain staging across diverse source levels |
| Bass/Treble Range | ±18 dB / ±14 dB in 2 dB steps - Configurable tonal shaping without external filter redesign |
| Speaker Attenuation | 0 to –37.5 dB per channel - Enables fader/balance control in 4-speaker car audio layouts |
| Signal-to-Noise Ratio | 102 dB - Ensures low-noise playback critical for high-fidelity cabin audio |
| Channel Separation | 100 dB at 1 kHz - Minimizes crosstalk between left/right audio paths |
| I²C Clock Speed | Up to 500 kbit/s - Allows fast configuration updates during audio mode transitions |
Pinout & Package
Package: SO-20 (Small Outline, 20-pin, 0.65 mm pitch, body size 12.6 × 7.6 mm). Compliant with JEDEC MS-013AC, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN_L) | Stereo Left Input | DC-biased analog input referenced to internal 3V rail; accepts up to 1.6 Vrms signal |
| 2 (GND) | Analog Ground | Common reference for all analog signal paths and biasing networks |
| 3 (IN_R) | Stereo Right Input | Identical function and specs to IN_L; supports independent L/R processing |
| 4 (MONO_IN/MUTE) | Mono Input / Hardware Mute | AM input; grounding disables selected input and forces reference voltage (mute) |
| 5 (VS) | Positive Supply | Single 7–10.2 V rail powering analog core and I²C logic |
| 6 (BOUT_L) | Left Front Output | Low-distortion push-pull output capable of driving 3 kΩ load |
| 7 (LOUD_L) | Loudness Compensation (L) | Internal loudness network output feeding left channel bass/treble path |
| 8 (BIN_L) | Bass Input (L) | Filtered bass signal path for left channel tone control |
| 9 (TRL) | Treble Input (L) | Filtered treble signal path for left channel tone control |
| 10 (CREF) | Reference Capacitor | Connects 68 nF capacitor to set internal reference stability and noise filtering |
| 11 (TRR) | Treble Input (R) | Filtered treble signal path for right channel tone control |
| 12 (BIN_R) | Bass Input (R) | Filtered bass signal path for right channel tone control |
| 13 (LOUD_R) | Loudness Compensation (R) | Internal loudness network output feeding right channel bass/treble path |
| 14 (BOUT_R) | Right Front Output | Low-distortion push-pull output identical to BOUT_L |
| 15 (SCL) | I²C Clock | Input-only clock line; 500 kbit/s max; requires external pull-up |
| 16 (SDA) | I²C Data | Open-drain bidirectional data line; requires external pull-up |
| 17 (OUT_LR) | Left Rear Output | Fourth speaker output; independently attenuatable and mute-capable |
| 18 (OUT_LF) | Left Front Output (Alt) | Duplicate left front output pin for PCB layout flexibility |
| 19 (OUT_RF) | Right Front Output (Alt) | Duplicate right front output pin for PCB layout flexibility |
| 20 (OUT_RR) | Right Rear Output | Fourth speaker output; independently attenuatable and mute-capable |
Key Features
| Feature | Design Value |
|---|---|
| Hardware Mute via MONO_IN pin | Enables fail-safe muting without I²C communication-critical for automotive power-on/off sequencing |
| Independent 4-channel speaker attenuation | Supports full fader (front/rear) and balance (left/right) control in car audio systems without external DACs |
| Programmable loudness compensation | Automatically boosts bass/treble at low volumes per ISO 226 equal-loudness contours, configurable from 0 to –15 dB |
| Integrated input selector with DC bias | Eliminates need for external coupling capacitors and bias resistors on IN_L/IN_R/MONO_IN inputs |
| 100 dB channel separation | Preserves stereo imaging integrity in compact head-unit PCB layouts with shared ground planes |
Applications
| Car Radio Head Unit | Aftermarket Audio Processor |
|---|---|
Use Scenario: Central audio processor in OEM car radio units handling AM/FM, CD, and auxiliary inputs. IC Role / Device Role / Timing Role: Analog signal conditioner and digital gain/tone controller managing input routing, volume, bass/treble, and 4-speaker level balancing. Use Value: Reduces BOM count by integrating tone control, mute, and speaker attenuation previously requiring discrete op-amps and DACs. | Use Scenario: Standalone audio enhancement module added to legacy car stereos lacking tone or fader control. IC Role / Device Role / Timing Role: Signal path processor inserting between source and amplifier, reconfigurable via microcontroller over I²C. Use Value: Enables retrofit loudness compensation and precise rear/fade leveling without modifying original head unit firmware. |
| Hi-Fi Preamp Controller | Multi-Zone Home Audio |
Use Scenario: Tone and level management stage in compact desktop or bookshelf amplifier designs. IC Role / Device Role / Timing Role: Analog front-end processor providing user-adjustable EQ and channel balance before power amplification. Use Value: Delivers studio-grade 102 dB SNR and <0.05% THD while supporting software-defined listening profiles. | Use Scenario: Zone-level audio conditioning in distributed home systems with separate front/rear speaker groups. IC Role / Device Role / Timing Role: Four-output attenuator enabling independent volume control per zone (e.g., living room, kitchen, bedroom). Use Value: Eliminates need for multiple analog potentiometers or motorized faders-controlled centrally via I²C host. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CS4272-CQZ | 24-bit stereo DAC + analog volume/tone; requires external ADC for analog input; I²S/PCM interface | Targets digital-source-centric systems (e.g., Bluetooth receivers); lacks hardware mute pin and mono AM input | Select when digital audio streams dominate and analog input count is low |
| AK4118VN | Audio DSP with programmable FIR filters; no integrated analog signal path; requires external op-amps and DACs | Suitable for custom EQ tuning and multi-band dynamics; not drop-in for analog front-end replacement | Select when algorithmic processing (e.g., parametric EQ, delay) is required beyond fixed bass/treble |
Compared with CS4272-CQZ and AK4118VN, the TDA7432D uniquely combines analog input multiplexing, hardware mute, and four independent speaker attenuators in a single SO-20 package-making it optimal for cost-sensitive, analog-input-dominant automotive audio systems requiring minimal external components.
Availability
TDA7432D is available at Aetrix Electronics and suitable for car radio head units, aftermarket audio processors, Hi-Fi preamplifier controllers, and multi-zone home audio systems requiring stable component supply and long-term obsolescence mitigation.
Supply support for TDA7432D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in analog, power, MCU, and automotive ICs with vertical manufacturing and broad automotive qualification coverage.
The TDA7432D belongs to ST's legacy automotive audio processor family, designed specifically for cost-effective, high-SNR analog signal conditioning in vehicle infotainment systems with minimal external component count.
FAQ
What is the maximum input signal level the TDA7432D can handle without clipping?
The TDA7432D supports a maximum input signal level of 1.6 Vrms (typical) at ≤0.3% THD, corresponding to its VCL (clipping level) specification. This allows direct interfacing with line-level sources such as CD players or Bluetooth receivers without external attenuation, provided the source output does not exceed this threshold under worst-case conditions.
Does the TDA7432D require external passive components for tone control?
Yes-the bass and treble filters rely on external RC networks: a 2.7 nF capacitor with 4.7 kΩ resistor sets the bass corner frequency, and a 68 nF capacitor with internal 50 kΩ resistance defines the treble response. These values are specified in the application circuit and must be populated per the datasheet layout to achieve rated ±18 dB bass and ±14 dB treble performance.
Can the TDA7432D operate from a 5V supply?
No-the TDA7432D requires a minimum supply voltage of 7 V and operates up to 10.2 V. It is not compatible with 5 V logic or supply rails. Attempting 5 V operation will result in improper biasing of internal op-amps and failure of analog signal paths; automotive and 9 V wall-adapter applications are its intended use cases.
Is there a recommended decoupling strategy for the VS and CREF pins?
ST recommends a 10 µF electrolytic capacitor plus 100 nF ceramic capacitor from VS to GND near the IC, and a 68 nF ceramic capacitor from CREF to GND. This dual-capacitor approach suppresses both low-frequency ripple and high-frequency switching noise, ensuring stable reference voltage generation and minimizing audible artifacts in the audio outputs.
TDA7432D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Audio Tone Processor
- Applications:
- Audio
- Number of Channels:
- 2
- Interface:
- I2C
- Voltage - Supply:
- 7V ~ 10.2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
TDA7432D FAQ
1.How can I place an order for TDA7432D through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7432D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA7432D reliable?
The price and inventory of TDA7432D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7432D is usually 5 days.
3.What payment methods are accepted for TDA7432D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7432D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7432D?
TDA7432D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7432D order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA7432D?
For technical support, including TDA7432D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7432D requirements.
6.How does Aetrix verify that TDA7432D is sourced from the original manufacturer or authorized distributors?
All TDA7432D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA7432D meets industry standards.
7.What is the process for return or replacement of TDA7432D?
All TDA7432D units undergo pre-shipment inspection (PSI). If there is an issue with TDA7432D, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA7432D part is unused and in its original packaging.
Return procedure for TDA7432D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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